EP2842609A2 - Dispositif de mise hors pression pour un boîtier encapsulé résistant à la pression doté d'un corps poreux monté en force - Google Patents

Dispositif de mise hors pression pour un boîtier encapsulé résistant à la pression doté d'un corps poreux monté en force Download PDF

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Publication number
EP2842609A2
EP2842609A2 EP14182519.0A EP14182519A EP2842609A2 EP 2842609 A2 EP2842609 A2 EP 2842609A2 EP 14182519 A EP14182519 A EP 14182519A EP 2842609 A2 EP2842609 A2 EP 2842609A2
Authority
EP
European Patent Office
Prior art keywords
porous body
passage
pressure relief
relief device
counter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14182519.0A
Other languages
German (de)
English (en)
Other versions
EP2842609B1 (fr
EP2842609A3 (fr
Inventor
Ulrich Mann
Bernd Limbacher
Helmut Würz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
R Stahl Schaltgeraete GmbH
Original Assignee
R Stahl Schaltgeraete GmbH
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Filing date
Publication date
Application filed by R Stahl Schaltgeraete GmbH filed Critical R Stahl Schaltgeraete GmbH
Publication of EP2842609A2 publication Critical patent/EP2842609A2/fr
Publication of EP2842609A3 publication Critical patent/EP2842609A3/fr
Application granted granted Critical
Publication of EP2842609B1 publication Critical patent/EP2842609B1/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C4/00—Flame traps allowing passage of gas but not of flame or explosion wave
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for 
    • B23P11/005—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  by expanding or crimping
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/26—Casings; Parts thereof or accessories therefor
    • H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/4987—Elastic joining of parts
    • Y10T29/49872—Confining elastic part in socket

Definitions

  • the invention relates to a pressure relief device for a protective housing for flameproof enclosure of resources that can form ignition sources.
  • the flameproof enclosure is a type of protection in explosion protection (Ex-d). This is based on electrical equipment that can be sources of a spark to enclose such that occurring inside the housing explosions do not cause flames, hot particles or gases to the outside could lead to igniting the atmosphere outside the protective housing.
  • pressure-tight encapsulation prevents damage to the protective housing at temperatures above the ignition temperature of flammable gases or dusts. Excessive pressure generated by an explosion in the protective housing with respect to the surroundings of the housing must be safely dissipated by balancing with the environment. To cool the hot gases and to extinguish potential sparks therefore a gas-permeable ignition-proof passage between the interior of the protective housing and the environment of the protective housing is provided.
  • the DE 10 2010 016 782 A1 describes a pressure relief device with a porous body, which is arranged in a receiving body.
  • the porous body has a pore closure in its edge region.
  • the edge pore closure is intended to prevent the flow around the porous body by a flame or hot gases.
  • the pore closure suggests the document, for example, to bias the porous body at its edge against a conical seat surface of the receiving body.
  • the document shows an embodiment with a tire-like body made of soft metal, which is arranged around the porous body and surrounds this edge.
  • the receiving body has an internal thread, into which a clamping nut is inserted, with the aid of which, the force required for the formation of the biasing force is exerted on the edge region of the porous body.
  • Another example shows a receiving body with an internal thread and a clamping nut, which squeezes the porous material of the porous body edge, so that there is a collapse of the pores of the porous body.
  • the pressure relief device according to the invention for a protective housing for explosion-proof encapsulation of equipment according to the type of protection flameproof enclosure has a receiving body having a passage and a mating surface.
  • the mating surface is annularly closed in a circumferential direction.
  • a porous body is arranged in the passage of the receiving body.
  • the porous body is free of ignition gaps and therefore designed to ignite.
  • the porous body has an outer peripheral surface and an inner and an outer passage surface.
  • the porous body is partially elastically deformed in a direction transverse to the counter surface or transversely to the circumferential direction. In addition, it can also be partially plastically deformed.
  • the porous body thereby abuts with its outer circumferential surface on the mating surface along the entire outer peripheral surface.
  • the elastic deformation and frictional engagement is achieved by an interference fit of the porous body with respect to the transverse dimension of the passage of the receiving body.
  • the system is gap-free in the sense that remaining gaps between the mating surface of the receiving body and the outer peripheral surface of the porous body are flameproof. Such possibly remaining gaps are reduced to a level at which flames or sparks can not penetrate and hot explosion gases or other gases leave the protective housing sufficiently cooled.
  • the interference fit is formed so that even in an edge region of the porous body following the voltage applied to the mating surface peripheral surface of the receiving body, the pores of the body are not completely collapsed, so that even through the edge region of the porous body gas exchange can take place.
  • the contour of the porous body in plan view of a passage surface is adapted to the cross-sectional contour of the passage at the location for the porous body.
  • both the porous body and the cross-sectional contour of the passage can be circular.
  • Other contours, such as polygons or contours with an arbitrary number of straight and / or curved sections are also possible.
  • a complex separate clamping device with threads and clamping nuts can be omitted.
  • the pressure relief device according to the invention can thereby be made more compact.
  • the pressure relief device can be made shallower with the receiving body and the porous body, i.
  • the porous body may also have an extension in the direction of passage which is as large as or greater than the extent of the receiving body or the mating surface in the direction of passage.
  • porous body is simplified over the prior art.
  • a pore closure for example by a ring surround of the porous body prior to insertion into the receiving body, is not necessary because of the interference fit. It has been found that solely by the interference fit without additional means or measures a flameproof arrangement of the porous body in the passage is possible. Additional compensation elements for adaptation to thermal expansion are not required.
  • the porous body is partially elastically deformed to reduce the size of the porous body transversely to the outer circumferential surface by means of a suitable tool or tool.
  • the porous body is arranged in the passage at an attachment point so that the outer peripheral surface abuts gap-free along the mating surface on the opposite surface.
  • the peripheral surface presses substantially uniformly against the counter surface delimiting the passage.
  • Zündspaltok is here understood that between the outer peripheral surface of the porous body and the counter surface of the receiving body may well remain gaps, however, lead to a sufficient cooling of combustion or explosive gases and to effectively prevent a Zünd bornschlags.
  • the cross-sectional area of an optionally existing gap between the receiving body and the porous body is smaller or at most as large as the pore size of the ignition-puncture-proof passage area in the porous body.
  • providing a porous body means separating out the porous body of porous material of the appropriate thickness.
  • the separation surface forms the peripheral surface of the porous body.
  • a change, in particular reduction, of the porosity and / or the pore size can be made compared with the remaining material of the porous body.
  • the porous body may be sintered into a mold.
  • no further process steps then take place for producing the porous body, for example the attachment of an enclosure.
  • the receiving body may be a separate from the other wall or other wall parts of the protective housing component or insert.
  • the outer wall or a wall portion of an outer wall of the protective housing itself is the receiving body.
  • the passage of the receiving body is adapted to connect the interior of the protective housing, in which the operating means are arranged, with the environment of the protective housing for pressure equalization.
  • the passage has a counter surface, which forms the contact surface for the porous body. against the counter surface, the partially elastically deformed porous body is supported.
  • the mating surface is annular in a circumferential direction closed.
  • An annularly closed surface is understood to mean not only the circular surface but also the elliptical, rectangular, polygonal or otherwise curved closed surface.
  • the counter surface or the inner peripheral surface of the receiving body which includes the counter surface, may be inclined at least one point in or against the passage direction, that is, for example, be conical.
  • the counter surface runs axially parallel to the passage direction, thus forming, for example, a cylinder jacket inner surface.
  • the passage may extend in an axial section subsequent to the mating surface, so that the diameter or cross section of the passage increases away from the mating surface in the region of this axial section.
  • the expanding axial section may constitute a means for introducing the porous body into the passage to the attachment site on the mating surface.
  • the mating surface can be smooth. Below this is a e.g. understood by mechanical processing state in which the surface roughness of the surface is at most as large as the maximum pore cross section of the porous body.
  • the mating surface can also have a random or regular surface structure, for example by laser processing or other blasting.
  • a surface structure can lead to an interlocking of the projections of the surface structure with the porous material of the porous body, so that, as it were, a "clawing" of the material on the peripheral surface of the porous body with the counter surface is achieved.
  • the hold of the porous body in the passage can thereby be improved.
  • the porous body has pores that allow gas exchange between the interior of the protective housing and the environment of the protective housing, but by their pore size, i. their (middle) cross-section their arrangement and their length lead to an effective extension of the path from the inner passage surface to the outer passage surface. That the gas is effectively cooled along the way. A possible spark goes out on the way through the pore body.
  • pores are meant, for example, not only disordered irregularly shaped openings and passages but also tubular passages extending axially along the direction of passage through the porous body, which have a small cross section.
  • the porous body is a tangled fiber composite part.
  • fibers are arranged irregularly and at least partially entwined with each other.
  • the pores produced by the random fiber composite are also irregularly arranged due to the irregular arrangement of the fibers and can have different cross sections and lengths. Overall, however, the pore size of the pores remains below a certain value, so that the flameproof enclosure is ensured.
  • the fibers have a diameter of at least 70 micrometers and a maximum of 130 micrometers.
  • the pore size in at least one or at least two spatial directions is preferably at least 80 micrometers and a maximum of 250 micrometers.
  • the porosity of the free, ie not inserted into the passage porous body at least 60% and a maximum of 80%.
  • Porosity irrespective of the embodiment of the porous body, is understood to mean the ratio of the pore volume to the total volume of the porous body.
  • the porous body is produced by sintering and is preferably made of powder-sintered material.
  • the porosity of the unoccupied and unimpacted porous body is preferably at least 45% and preferably at most 60%.
  • the pore size in at least one or at least two spatial directions is preferably at least 50 micrometers and a maximum of 100 micrometers.
  • the porous body 24 has a non-zero porosity P at each location.
  • the porosity P is substantially the same throughout, without external deformation forces on the body.
  • the sintered porous body may be made by sintering particles such as powder or fibers.
  • the minimum thickness i. the extent of the body from the inner passage surface to the outer passage surface in the passage direction at least 5 mm to 10 mm.
  • the porous body is preferably made of temperature-resistant material.
  • the fibers of the random fiber composite consist of temperature-resistant material.
  • the material is preferably temperature resistant up to a temperature of at least 400 °.
  • the structure becomes The porous body even at high temperatures of up to 400 ° C or even not or only slightly changed, so that in any case no ignition gap is formed in the passage.
  • the temperature resistance of the material used can ensure, for example, that the passage of hot gases through the porous body does not lead to a sticking of the pores and / or a loss of the partial elasticity and / or the stiffness of the porous body.
  • the material of the porous body may be, for example, metal, e.g. to steel, act.
  • the body for example the metal particles or the fibers, is preferably made of an alloyed steel, in particular of a chromium-alloyed steel, for example stainless steel.
  • the porous body for example its fibers, may also be made of another material, for example plastic or ceramic.
  • the random fiber composite may also include mixed fibers, i. Have fibers of two different materials, such as different metals.
  • the local porosity of the porous body inserted in the passage of the receiving body can decrease radially outwards or in the direction towards the counter-surface.
  • a zone of reduced porosity may be formed in an edge region of the porous body.
  • the porous body can also be inserted into the passageway of a uniform, i. have constant, porosity over the entire porous body.
  • the porosity of the loose porous body may be uniform or uneven throughout the porous body.
  • the pressure relief device comes with the receiving body and the porous Body with no axial seat, stops or other axial retention means for the porous body.
  • the retention of the porous body in the passage is achieved in one embodiment solely by the radial deformation or the deformation transverse to the mating surface.
  • At least one axial stop may be disposed adjacent to at least one of the two passage surfaces of the porous body in the passageway and project transversely inwardly from the passage defining wall.
  • the at least one axial stop can serve to predetermine a defined position of the porous body in the passage and thus represent a positioning aid when inserting the porous body into the passage.
  • the at least one axial stop may also be arranged as securing means for axially securing the position of the porous body in the passage.
  • the porous body may also be biased against the at least one axial stop. In a preferred embodiment, however, no biasing against an axial proposal is provided.
  • a gas exchange is possible over the entire cross section and in particular in an edge region of the passage area.
  • a stop serving to secure the porous body against pushing out of the passage can also be arranged axially at a distance from the porous body so that a gap remains between the stop and the porous body, whereby the entire passage area of the porous body for the gas exchange Available.
  • the porous body at or on the mating surface on an edge region with a pore size and / or porosity, compared to the Pore size and / or porosity of the rest of the porous body is reduced.
  • the edge region projects transversely to the circumferential direction, for example radially inward, of the porous body does not protrude beyond the at least one axial stop.
  • the free flow cross section in the passage can be limited by the at least one axial stop, in particular if the at least one stop is designed as an annular shoulder or as an annular shoulder. In this embodiment, it is ensured that the edge region with reduced pore size and / or porosity does not protrude beyond the axial stop into the free flow cross section of the passage.
  • at least the gas volume flow is ensured by the passage and the porous body, which is determined by the free flow cross-section and the pore size and / or porosity of the body outside the edge region.
  • the porous body may also include gas impermeable portions in one embodiment.
  • the porous body may have on an outer peripheral surface of the porous material a cuff, e.g. can be made of soft metal.
  • the porous body with the porous material and the sleeve is partially elastically and partially plastically deformed and inserted into the passage to form a press fit.
  • the cuff adapts to the counter surface of the passage with no gaps.
  • the porous body is entirely made of a uniform material.
  • FIG. 1 shows an explosion-proof protective housing 10, which is executed in accordance with the type of protection "flameproof enclosure" (Ex-d), for example.
  • operating means are arranged separately from the environment of the protective housing such that a potentially explosive atmosphere in the environment can not be ignited by an ignition source formed by the operating means.
  • the resources are, for example, electrical and / or electronic equipment, such as relays.
  • the protective housing 10 has a pressure relief device 12, which is inserted into a wall section 14 of the protective housing 10.
  • the protective housing 10 may also have a plurality of pressure relief devices 12.
  • the pressure relief device 12 has a gas-permeable passage 22 which allows a flameproof gas flow between the interior of the protective housing 10 and the environment.
  • the pressure relief device 12 has a flange 16 and a receiving body 18.
  • the receiving body 18 has a cylindrical basic shape.
  • the passage 22 passes through the receiving body 18 completely.
  • the pressure relief device 12 may optionally be sealed to the flange 16 against the wall portion 14 of the protective housing 10 with a seal 20. As a result, compliance with the requirement for an IP degree of protection of the protective housing 10 can be ensured.
  • FIG. 2 shows a cross-sectional view of the pressure relief device 12 after FIG. 1 ,
  • a porous body 24 is inserted.
  • the porous body 24 has an inner passage surface 26, an outer passage surface 28 and an outer peripheral surface 30.
  • the circumferential surface 30 connects the two passage surfaces 26, 28.
  • the porous body 24 is in plan view of one of the two Passage areas 26, 28 seen circular. But he can deviate from this also have a different circumferential contour.
  • the peripheral contour of the porous body 24 is adapted, for example, to the cross-sectional contour of at least the portion of the passage 22 with the attachment point at which the porous body 24 is arranged in the passage 22.
  • the circumferential contour of the porous body 24 results from a centric extension of the cross-sectional contour at the attachment site with a positive extension factor.
  • the porous body 24 has an excess over the passage 22 at the attachment site.
  • the porous body 24 is a cylindrical disk and the cross-sectional contour at the mounting location is circular.
  • the peripheral shapes of the porous body 24 and the passage 22 may also differ.
  • the porous body 24 may be slightly elliptical while the passage 22 has a circular cross-section.
  • the porous body 24 abuts against a portion of an inner circumferential surface 32 of the receiving body 18 along its entire outer circumferential surface 30. This portion of the inner peripheral surface 32 on the receiving body 18 forms a mating surface 34 for the porous body 24.
  • the mounting location for the porous body 24 is thus located on the mating surface 34.
  • a mechanical pressing force or stress caused by a partial elastic deformation of the porous body 24 transversely to the mating surface 34.
  • This pressing force or stress is caused by the fact that the force applied by an external force, not inserted into the passage 22, porous body 24 has a dimension d ', which is greater than the corresponding dimension d of the passage 22 on the counter surface 34.
  • the porous body 24 thus has in an unencumbered by an external force state an excess at each point the outer peripheral surface 30 in a direction transverse to its outer peripheral surface 30 compared to the dimension of the passage 22 transversely to the counter surface 34. Due to the excess, a frictional fit or connection of the porous body 24 in the passage 22 is achieved. At the in FIG. 2a illustrated embodiment, this non-positive connection is the only means for connection between the receiving body 18 and the porous body 24. In an explosion in the interior of the protective housing 10 holds in this embodiment alone the frictional connection by the excess between the porous body 24 and the cross section of the passage 22 on the mating surface 34 of the force due to the explosion stand. Other positive or material-locking connections are in the in FIG. 2a embodiment shown not available.
  • the porous body 24 is arranged without an ignition gap in the passage 22. He presses with its outer peripheral surface 30 flat against the counter surface 34, whereby the formation of ignition gaps is prevented.
  • the porous body 24 has a porosity and / or pore size which ensures sufficient cooling of hot gases as they pass through the porous body 24 and extinguish potential sparks.
  • porous body 24 is a tangled fiber composite part. It consists of individual, for example, metallic fibers 36, which are arranged irregularly and intertwined in the porous body 24.
  • the individual fibers 36 can also be connected to one another, for example, by a sintering process.
  • the porous body 24 has a certain elasticity and can thereby transverse to the outer peripheral surface 30 to dimensions less than or equal to the dimensions of the passage 22 on the mating surface 34, for example, the diameter d , partially elastically deform.
  • the porosity P of the porous body 24 is in the embodiment according to FIG. 2a at least 60% to a maximum of 80%.
  • the maximum pore diameter may be at least 80 microns to a maximum of 250 microns.
  • the fibers 36 have a fiber diameter of at least 70 micrometers and a maximum of 130 micrometers.
  • FIG. 2b a porous body 24 which is unloaded by external forces and which has an output diameter d ', the magnitude of this output diameter d' being greater than the diameter d of the passage 22 on the mating surface 34.
  • the porous body 24 thus has an oversize relative to the counter surface 34 of the passage 22.
  • the porous body 24 is in this embodiment after FIG. 2b made of sintered metallic material, in particular powder, and has, for example, a porosity P of at least 45% and at most 65%. It has, for example, a pore size in at least one or two spatial directions parallel to the plane in which the passage surfaces 26, 38 extend, from at least 50 micrometers to a maximum of 100 micrometers.
  • the material is the porous body 24 preferably temperature resistant for temperatures up to at least 400 ° C.
  • the porosity in an outer edge region 38 of the porous body 24 adjacent to the peripheral surface 30 to be smaller than in the rest of the porous body 24.
  • the fibers 36 are somewhat denser. Nevertheless, a gas exchange is preferably possible over the entire dimension or over the entire cross section of the passage 22, in which a porosity greater than zero also prevails in the edge region 38.
  • the resulting distance for a gas flowing through the porous body 24 through the labyrinth of the pores of the porous body 24 is at least as long in the edge region 38 as in the radially inner region of the porous body 24, so that the Zünd manschlagrock the pressure relief device 12 of the protective housing 10th remains guaranteed.
  • the resulting distance for a gas flowing through the porous body 24 is also determined by the thickness D of the porous body 24, the bspg. at least 5 mm to 10 mm.
  • the mating surface 34 of the receiving body 18 is preferably smooth, i. it has a roughness which is less than the maximum pore transverse dimension, e.g. the pore diameter is. However, it may also have regular and irregular structures, such as grooves, which cause a meshing or snagging of the material on the peripheral surface 30 of the porous body 24 with the mating surface 34.
  • the inner peripheral surface 32 of the receiving body 18 has in the FIG. 2a a cylindrical basic shape with a circular cross section. But she can also do one having differently shaped cross-section, for example, with a polygonal, square or rectangular or otherwise curved circumference.
  • the inner circumferential surface 32 of the receiving body 18 can also taper in sections or as a whole conically in or counter to the passage direction R.
  • the counter surface 34 can taper conically in the passage direction R from the interior of the protective housing 10 to the surroundings of the protective housing 10.
  • the outer peripheral surface 30 of the inserted porous body 24 thus tapers in the passage direction R.
  • Conically running at least a portion of the inner peripheral surface 32 adjacent the mating surface 34 may also serve as an aid to facilitate insertion of the porous body 24 into the passage 22.
  • FIG. 3a shows a further embodiment of a pressure relief device 12 with a porous body inserted into a passage 22 24.
  • an annular stop 40 is present in the passage 22 of the receiving body 18 on at least one side of the porous body 24 and, for example, on the side of the inner passage surface 26 in the passage 22 of the receiving body 18 on at least one side of the porous body 24 and, for example, on the side of the inner passage surface 26.
  • the stop 40 forms an annular step and reduces the diameter or cross section of the passage 22 with respect to the counter surface 34.
  • the stop 40 may be an integral part of the receiving body 18 and be seamless and joint-free connected to the receiving body 18 of the same material.
  • the stopper 40 for example, also cohesively with the receiving body 18 be connected.
  • the stop 40 may also be formed by an extension of the flange 16, which covers an edge portion 50 of the passage 22 and thereby protrudes into the passage 22 ( FIG. 4a ).
  • a ring nut 42 may be screwed into an internal thread in the passage 22.
  • the porous body 24 can be clamped by means of the ring nut 42 against the stop ring 40 or secured without axial force only against displacement in the passage 22.
  • the ring nut is therefore either a clamping means for axial loading of the porous body 24 or a securing means.
  • Such a ring nut 42 may also be present instead of the immovably fixed stop 40 on both sides of the porous body 24.
  • the porosity and / or pore size as already described in comparison to the rest of the porous body by the partially elastic deformation of the porous body a little less.
  • the stop ring 40 and / or the ring nut 42 protrude at right angles to the peripheral surface 30 does not protrude beyond the edge region 38. Thereby, the gas flow through the porous body 24 becomes out of the peripheral area 38 is not hindered by the stop 40 and / or the ring nut 42.
  • FIG. 3b shows a pressure relief device 12 with a receiving body 18 and a porous body 24 inserted, wherein before the outer passage surface 28 of the porous body 24, a stop 40 is formed from at least three circumferentially spaced projections 46. These projections 46 provide additional mechanical security without appreciably restricting the cross-section of the passage 22. The gas flow through the porous body 24 is also predominantly ensured in the edge region 38 and only slightly limited at the points where the projections 46 are located.
  • FIG. 4a shows in cross-section a further embodiment of the pressure relief device 12. Based on FIG. 4a An embodiment of methods for manufacturing the pressure relief device 12 will also be described.
  • the through-bore 22 has a first diameter d1 in a cylindrical first section 22a following the stop 40.
  • the first section 22a has an axial extension h in the passage direction R.
  • the inner peripheral surface 32 forms in the region of the first section 22a a circumferentially U-shaped closed counter surface 34 for the porous body 24.
  • the first section 22a is followed by a conically widening second section 22b. Adjacent thereto, on the larger diameter side of the second portion 22b, in the wall of the passage 22 is a annular groove 54 is recessed.
  • the adjoining the groove 54 third portion 22c of the passage 22 has a second diameter d2.
  • the receiving body 18 defines a passage direction R.
  • the porous body 24 may have been separated from a flat stock portion 56 of fiberglass. Possible separation methods for separating a porous body are, for example, laser, plasma or water jet cutting or punching. In some separation processes, there may be a structural change, for example, of a melting, in particular in an edge zone of the porous body 24, for example on the outer circumferential surface 30. For example, fibers can fuse together or form cohesive joints.
  • the undeformed porous body 24 has an initial diameter d 'that is greater than the first diameter d1 of the passage 22.
  • the loose porous body 24 accordingly has an oversize relative to the mating surface 34 of the passage 22.
  • the oversize refers to a dimension of the passage 22 transverse to a passage direction R of the receiving body 18.
  • the second diameter d2 of the third portion 22c is preferably at least as large as the initial diameter d 'of the porous body 24.
  • the porous body 24 When mounting the pressure relief device 12, the porous body 24 is first inserted into the third portion 22c of the passage 22 with the diameter d2. The porous body 24 is then further inserted into the second portion 22b, whereby it is compressed and deformed. The conicity of this second section 22b serves as an aid for deforming the porous body 24. About this second portion 22b of the porous body 24 is further moved until it finally rests against the counter surface with the first diameter d1 in the first portion 22a and is held there non-positively. The porous body 24 is pushed according to the example to the stop 40.
  • the thickness D of the porous body 24 may be equal to or smaller than the axial extent h of the first portion 22a and thus of the mating surface 34.
  • a securing means - may be used - as an alternative to the lock nut 42 -, for example, a snap ring.
  • a cohesive connection can be used for securing, for example by gluing.
  • FIG. 4b Figure 16 is a schematic diagram illustrating the deformation of the porous body 24 when inserted into the passageway 22.
  • the porosity P and / or the pore size is locally localized in a peripheral region 38 of the porous body 24 in a partially elastically deformed, densely packed, porous state Material P less than in the other regions of the porous body 24.
  • the porosity P and / or the pore size increases in the edge region 38 at a right angle from the outer peripheral surface 30 inwardly toward the center M of the porous body 24. Outside the edge region 38, the porosity P and / or the pore size is substantially uniform.
  • porous body 24 is a cylindrical disc.
  • the shape of the body 24 is thus to the cylindrical through hole customized.
  • the porous body 24 may also have a peripheral shape deviating from the peripheral shape of the passage 22.
  • relatively rough tolerances in the manufacture of the passage 22 and of the porous body 24 lead to a secure connection of the porous body 24 in the passage 22.
  • a gap-free seal of the receiving body 18 against the wall of a protective housing can be achieved, for example, by a flat sealing ring inserted in the sealing groove 58 surrounding the flange 16.
  • the wall section 14 of the protective housing 10 can also serve directly as a receiving part.
  • the passage 22 may be present as a hole directly in the wall portion 14.
  • the porous body 24 sits directly in the passage 22 in the wall portion 14 and is also held by the interference fit. The various options described above for axially securing the porous body 24 can also be used.
  • a receiving body 18 is provided, which is adapted to receive a porous body 24 in a passage 22 of the receiving body 18.
  • a provided porous body 24 is placed in the passage 22.
  • the porous body 24 is partially elastically deformed in the passage 22 by an interference fit.
  • the porous body 24 is thereby supported against a counter surface 34 of the receiving body 18 along its circumference and is thereby held securely in the passage 22.
  • the arrangement is due to the positive engagement of the porous body 24th Completed along its circumference on the counter surface 34 in the sense of the type of protection flameproof enclosure.

Landscapes

  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Exhaust Silencers (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Safety Valves (AREA)
  • Powder Metallurgy (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP14182519.0A 2013-08-27 2014-08-27 Dispositif de mise hors pression pour un boîtier encapsulé résistant à la pression doté d'un corps poreux monté en force Active EP2842609B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013109261.6A DE102013109261A1 (de) 2013-08-27 2013-08-27 Druckentlastungsvorrichtung für druckfest gekapselte Gehäuse mit einem porösen Körper mit Übermaßpassung

Publications (3)

Publication Number Publication Date
EP2842609A2 true EP2842609A2 (fr) 2015-03-04
EP2842609A3 EP2842609A3 (fr) 2015-08-05
EP2842609B1 EP2842609B1 (fr) 2020-10-21

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EP14182519.0A Active EP2842609B1 (fr) 2013-08-27 2014-08-27 Dispositif de mise hors pression pour un boîtier encapsulé résistant à la pression doté d'un corps poreux monté en force

Country Status (5)

Country Link
US (1) US9492694B2 (fr)
EP (1) EP2842609B1 (fr)
CN (1) CN104421469B (fr)
BR (1) BR102014021006A2 (fr)
DE (1) DE102013109261A1 (fr)

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WO2018001832A1 (fr) * 2016-06-29 2018-01-04 Eaton Protection Systems Ip Gmbh & Co. Kg Dispositif de décompression
WO2018219696A1 (fr) * 2017-06-01 2018-12-06 R. Stahl Schaltgeräte GmbH Boîtier pourvu d'un élément dépressurisation incorporé par moulage
WO2020156848A1 (fr) * 2019-01-31 2020-08-06 R. Stahl Schaltgeräte GmbH Dispositif anti-explosion comportant un chemin d'écoulement de gaz anti-décharge d'étincelle et dissipateur thermique
WO2020233982A1 (fr) * 2019-05-17 2020-11-26 R. Stahl Schaltgeräte GmbH Châssis pour boîtier protégé contre les explosions

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US20160375285A1 (en) * 2015-06-25 2016-12-29 Tescom Corporation Flame arrestor assembly
DE102015112285A1 (de) * 2015-07-28 2017-02-02 R.Stahl Schaltgeräte GmbH Explosionsgeschützte Anordnung und Verfahren zu deren Herstellung
DE102015112287A1 (de) * 2015-07-28 2017-02-02 R. Stahl Schaltgeräte GmbH Explosionsgeschützte Anordnung und Verfahren zu deren Herstellung
CN105811163A (zh) * 2016-05-26 2016-07-27 上海绿筑光能系统技术有限责任公司 一种光伏mc4接头阻燃装置
JP6713935B2 (ja) * 2017-01-12 2020-06-24 株式会社日立産機システム スイッチギヤ
EP3631923B1 (fr) 2017-06-01 2023-01-18 R. STAHL Schaltgeräte GmbH Dispositif de décharge de pression soudé
DE102017122957A1 (de) * 2017-10-04 2019-04-04 R. Stahl Schaltgeräte GmbH Geschweißte Druckentlastungsvorrichtung
DE102017112150B4 (de) * 2017-06-01 2019-02-07 R.Stahl Schaltgeräte GmbH Explosionssicheres Gehäuse mit innerer Druckreduzierung
DE102017112153A1 (de) * 2017-06-01 2018-12-06 R. Stahl Schaltgeräte GmbH Explosionssicheres Gehäuse mit innerer Druckentlastung
DE102017119982A1 (de) * 2017-08-31 2019-02-28 R. Stahl Schaltgeräte GmbH Gehäuse der Schutzart druckfeste Kapselung und Herstellverfahren für dieses
KR102474379B1 (ko) * 2018-04-18 2022-12-05 현대자동차 주식회사 밸브 장치
EP3663619B1 (fr) 2018-12-07 2022-03-16 Danfoss Power Solutions Aps Dispositif de secours thermique
US20200398090A1 (en) * 2019-06-21 2020-12-24 Kewaunee Scientific Corporation Ceramic foam flame arrestor assembly for flammable storage cabinet
DE102019131195A1 (de) * 2019-11-19 2021-05-20 R. Stahl Schaltgeräte GmbH Gehäuse

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
WO2018001832A1 (fr) * 2016-06-29 2018-01-04 Eaton Protection Systems Ip Gmbh & Co. Kg Dispositif de décompression
EA039186B1 (ru) * 2016-06-29 2021-12-15 Итон Интеллиджент Пауэр Лимитед Устройство для сброса давления
US11420082B2 (en) 2016-06-29 2022-08-23 Eaton Intelligent Power Limited Pressure release device
WO2018219696A1 (fr) * 2017-06-01 2018-12-06 R. Stahl Schaltgeräte GmbH Boîtier pourvu d'un élément dépressurisation incorporé par moulage
RU2753683C2 (ru) * 2017-06-01 2021-08-19 Р. Шталь Шальтгерете Гмбх Корпус с залитым устройством сброса давления
US11569642B2 (en) 2017-06-01 2023-01-31 R. Stahl Schaltgeräte GmbH Housing having cast pressure relief means
WO2020156848A1 (fr) * 2019-01-31 2020-08-06 R. Stahl Schaltgeräte GmbH Dispositif anti-explosion comportant un chemin d'écoulement de gaz anti-décharge d'étincelle et dissipateur thermique
US12029001B2 (en) 2019-01-31 2024-07-02 R. Stahl Schaltgeräte GmbH Explosion-proof apparatus with a flameproof gas flow path and heat sink
WO2020233982A1 (fr) * 2019-05-17 2020-11-26 R. Stahl Schaltgeräte GmbH Châssis pour boîtier protégé contre les explosions

Also Published As

Publication number Publication date
EP2842609B1 (fr) 2020-10-21
CN104421469A (zh) 2015-03-18
CN104421469B (zh) 2019-01-22
EP2842609A3 (fr) 2015-08-05
US20150060445A1 (en) 2015-03-05
BR102014021006A2 (pt) 2015-09-22
DE102013109261A1 (de) 2015-03-05
US9492694B2 (en) 2016-11-15

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